The answer is to set the CodeBuild project's trigger to use the CloudWatch Events rule, which is the correct approach because CloudWatch Events can detect repository state changes from CodeCommit and automatically invoke the CodeBuild project, eliminating the need for manual polling or custom webhooks. This works by creating an event rule that matches specific CodeCommit events—such as pushes to the main branch—and routes them as targets to the CodeBuild project, ensuring every commit triggers a build without additional infrastructure. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of event-driven automation versus polling-based triggers; a common trap is selecting a Lambda-based custom solution when the native CloudWatch Events integration is simpler and more reliable. Remember that CodeCommit does not natively support direct build triggers, so CloudWatch Events acts as the bridge—think of it as the "event bus" that connects your source changes to your build pipeline. A useful memory tip: "CloudWatch catches the commit, CodeBuild builds the fit."
DOP-C02 Configuration Management and IaC Practice Question
This DOP-C02 practice question tests your understanding of configuration management and iac. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company uses AWS CodeCommit as a source repository and AWS CodeBuild for building artifacts. The DevOps team wants to ensure that all commits to the main branch trigger a build. Which steps should be taken? (Choose THREE.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the CodeBuild project to use the CodeCommit repository as the source and specify the main branch
Option A is correct because configuring the CodeBuild project to use the CodeCommit repository as the source and specifying the main branch ensures that CodeBuild knows which repository and branch to monitor for changes. This is the foundational step that links the source code to the build project, enabling automated builds when commits are pushed to the main branch.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Configure the CodeBuild project to use the CodeCommit repository as the source and specify the main branch
Why this is correct
The CodeBuild project must know the source and branch.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure a webhook in the CodeCommit repository to notify CodeBuild
Why it's wrong here
Webhooks are for third-party repositories like GitHub; CodeCommit uses CloudWatch Events.
✓
Create a CloudWatch Events rule that listens for CodeCommit repository state changes on the main branch
Why this is correct
CloudWatch Events can trigger CodeBuild on commits to specific branches.
Related concept
Read the scenario before looking for a memorised answer.
✓
Set the CodeBuild project's trigger to use the CloudWatch Events rule
Why this is correct
The CloudWatch Events rule needs to target the CodeBuild project.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use AWS CodeDeploy to trigger the build on commits
Why it's wrong here
CodeDeploy is not involved in triggering builds.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse CodeCommit's lack of native webhook support with other Git providers, leading them to select Option B, or they mistakenly think CodeDeploy can trigger builds instead of deployments.
Detailed technical explanation
How to think about this question
Under the hood, the CloudWatch Events rule (Option C) listens for CodeCommit repository state changes (e.g., 'ReferenceCreated' or 'ReferenceUpdated' events) on the main branch. When a commit is pushed, the rule invokes CodeBuild as a target (Option D), which starts a build. This event-driven architecture avoids polling and provides near-real-time build triggers, essential for CI/CD pipelines where latency matters.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Configuration Management and IaC — This question tests Configuration Management and IaC — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure the CodeBuild project to use the CodeCommit repository as the source and specify the main branch — Option A is correct because configuring the CodeBuild project to use the CodeCommit repository as the source and specifying the main branch ensures that CodeBuild knows which repository and branch to monitor for changes. This is the foundational step that links the source code to the build project, enabling automated builds when commits are pushed to the main branch.
What should I do if I get this DOP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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